Test tube receptacle



FIG. 1 is a front perspective view of the test tube receptacle showing my new design;

FIG. 2 is a right side elevational view of the test tube receptacle thereof;

FIG. 3 is a left side elevational view of the test tube receptacle thereof;

FIG. 4 is a top plan view of the test tube receptacle thereof; and,

FIG. 5 is a bottom plan view of the test tube receptacle thereof. 

The ornamental design for the test tube receptacle, as shown and described. 